<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@ page import="javax.servlet.http.Cookie" %>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>欢迎页面</title>
</head>
<body>
<%
    // 获取请求中的 Cookies
    Cookie[] cookies = request.getCookies();
    String username = null;

    // 查找名为 "username" 的 Cookie
    if (cookies != null) {
        for (Cookie cookie : cookies) {
            if ("username".equals(cookie.getName())) {
                username = cookie.getValue();
                break;
            }
        }
    }

    if (username != null) {
        // 用户已登录，显示欢迎信息
%>
<h1>欢迎你，<%= username %>！</h1>
<p>这是我的博客首页</p>
<%
    } else {
        // 用户未登录，提示并倒计时跳转到登录页面
%>
<h1>您尚未登录！</h1>
<p>页面将在 <span id="countdown">5</span> 秒后跳转到登录页面。</p>
<script type="text/javascript">
    var count = 5;
    var countdown = document.getElementById("countdown");
    var interval = setInterval(function() {
        count--;
        countdown.textContent = count;
        if (count <= 0) {
            clearInterval(interval);
            window.location.href = "login.jsp";
        }
    }, 1000);
</script>
<%
    }
%>
</body>
</html>